“…The above proposals made innovative use of airborne equipment and resources of UAVs, e. g., cameras, maps, IMUs to design promising out-of-band ways to detect GPS spoofing attacks. For instance, the method proposed by Zhu et al [68], however, relied on human detection and could not be fully automated. Others leveraged traditional hand-crafted visual features with performance impairment [33], or applied visual features to rectify data and compensate the drift from other sensors [10], requiring extra devices (i. e., IMUs) to cooperate with a camera.…”